TP-Link WDR3600 RENEW IP missing, no internet, WAN IP

[clooge]

I am using the latest build. I even tried the previous 1.5.8 builds.
Please help no connectivity

Router is behind DOCSIS 3.0 modem to comcast. No internet connectivity, the Renew IP button is greyed out for DHCP (wired) 1.5.9 on TP-Link WDR3600


Steps I tried, installed 1.5.9 factory, then did sysupgrade on new router

• gargoyle_1.5.9-ar71xx-generic-tl-wdr3600-v1-squashfs-factory.bin

1. gargoyle_1.5.9-ar71xx-generic-tl-wdr3600-v1-squashfs-sysupgrade.bin

• Then I reverted back to 1.5.8 factory and upgrade to 1.5.8 sysupgrade

The router wont see the IP of the cable modem. The renew button is greyed out under - wired DHCP (wired)
I looked at this, but I am not expert, and did NOT ssh into the router.
https://forum.openwrt.org/viewtopic.php?id=41675
https://forum.openwrt.org/viewtopic.php?id=43131